单项选择题
A.CCS marine surveyor B.certified marine chemist C.port engineer D.MSA marine inspector
A fire of escaping liquefied flammable gas is best exti...
单项选择题A fire of escaping liquefied flammable gas is best extinguished by（）.
A.cooling the gas below the ignition point B.cutting off the supply of oxygen C.stopping the flow of gas D.interrupting the chain reaction
A chemical additive to LPG gives it a characteristic（）....
单项选择题A chemical additive to LPG gives it a characteristic（）.
A.odor B.color C.pressure D.density
On a hydrocarbon flammability chart the line which exte...
单项选择题On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.
A.mimimum oxygen content line B.critical displacement line C.critical dilution line D.upper threshold limit
